[MacPorts] #60941: llvm-5.0 llvm-6.0 llvm-7.0 llvm-8.0 llvm-9.0 llvm-10 llvm-devel: Support arm64

[MacPorts]

#60941: llvm-5.0 llvm-6.0 llvm-7.0 llvm-8.0 llvm-9.0 llvm-10 llvm-devel: Support
arm64
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  Reporter:  ryandesign                          |      Owner:  jeremyhu
      Type:  enhancement                         |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  llvm-5.0 llvm-6.0 llvm-7.0          |
  llvm-8.0 llvm-9.0 llvm-10 llvm-devel           |
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Comment (by ryandesign):

 Replying to [comment:1 jeremyhu]:
 > We're not going to backport support for Apple Silicon Macs to older
 versions of llvm.

 Then I suppose there might need to be some changes to the MacPorts base
 compiler selection process, so that it does not add old versions of clang
 to the fallback list on arm64 if they don't support arm64?

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Ticket URL: <https://trac.macports.org/ticket/60941#comment:3>
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